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233
java/javax/el/CompositeELResolver.java
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233
java/javax/el/CompositeELResolver.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.el;
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import java.beans.FeatureDescriptor;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import java.util.Objects;
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public class CompositeELResolver extends ELResolver {
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private static final Class<?> SCOPED_ATTRIBUTE_EL_RESOLVER;
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static {
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Class<?> clazz = null;
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try {
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clazz = Class.forName("javax.servlet.jsp.el.ScopedAttributeELResolver");
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} catch (ClassNotFoundException e) {
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// Ignore. This is expected if using the EL stand-alone
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}
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SCOPED_ATTRIBUTE_EL_RESOLVER = clazz;
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}
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private int size;
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private ELResolver[] resolvers;
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public CompositeELResolver() {
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this.size = 0;
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this.resolvers = new ELResolver[8];
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}
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public void add(ELResolver elResolver) {
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Objects.requireNonNull(elResolver);
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if (this.size >= this.resolvers.length) {
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ELResolver[] nr = new ELResolver[this.size * 2];
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System.arraycopy(this.resolvers, 0, nr, 0, this.size);
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this.resolvers = nr;
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}
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this.resolvers[this.size++] = elResolver;
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}
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@Override
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public Object getValue(ELContext context, Object base, Object property) {
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context.setPropertyResolved(false);
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int sz = this.size;
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for (int i = 0; i < sz; i++) {
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Object result = this.resolvers[i].getValue(context, base, property);
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if (context.isPropertyResolved()) {
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return result;
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}
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}
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return null;
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}
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/**
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* @since EL 2.2
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*/
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@Override
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public Object invoke(ELContext context, Object base, Object method,
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Class<?>[] paramTypes, Object[] params) {
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context.setPropertyResolved(false);
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int sz = this.size;
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for (int i = 0; i < sz; i++) {
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Object obj = this.resolvers[i].invoke(context, base, method, paramTypes, params);
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if (context.isPropertyResolved()) {
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return obj;
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}
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}
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return null;
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}
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@Override
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public Class<?> getType(ELContext context, Object base, Object property) {
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context.setPropertyResolved(false);
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int sz = this.size;
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for (int i = 0; i < sz; i++) {
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Class<?> type = this.resolvers[i].getType(context, base, property);
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if (context.isPropertyResolved()) {
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if (SCOPED_ATTRIBUTE_EL_RESOLVER != null &&
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SCOPED_ATTRIBUTE_EL_RESOLVER.isAssignableFrom(resolvers[i].getClass())) {
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// Special case since
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// javax.servlet.jsp.el.ScopedAttributeELResolver will
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// always return Object.class for type
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Object value = resolvers[i].getValue(context, base, property);
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if (value != null) {
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return value.getClass();
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}
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}
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return type;
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}
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}
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return null;
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}
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@Override
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public void setValue(ELContext context, Object base, Object property, Object value) {
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context.setPropertyResolved(false);
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int sz = this.size;
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for (int i = 0; i < sz; i++) {
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this.resolvers[i].setValue(context, base, property, value);
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if (context.isPropertyResolved()) {
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return;
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}
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}
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}
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@Override
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public boolean isReadOnly(ELContext context, Object base, Object property) {
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context.setPropertyResolved(false);
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int sz = this.size;
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for (int i = 0; i < sz; i++) {
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boolean readOnly = this.resolvers[i].isReadOnly(context, base, property);
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if (context.isPropertyResolved()) {
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return readOnly;
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}
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}
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return false;
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}
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@Override
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public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
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return new FeatureIterator(context, base, this.resolvers, this.size);
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}
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@Override
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public Class<?> getCommonPropertyType(ELContext context, Object base) {
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Class<?> commonType = null;
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int sz = this.size;
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for (int i = 0; i < sz; i++) {
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Class<?> type = this.resolvers[i].getCommonPropertyType(context, base);
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if (type != null && (commonType == null || commonType.isAssignableFrom(type))) {
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commonType = type;
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}
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}
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return commonType;
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}
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@Override
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public Object convertToType(ELContext context, Object obj, Class<?> type) {
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context.setPropertyResolved(false);
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int sz = this.size;
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for (int i = 0; i < sz; i++) {
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Object result = this.resolvers[i].convertToType(context, obj, type);
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if (context.isPropertyResolved()) {
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return result;
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}
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}
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return null;
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}
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private static final class FeatureIterator implements Iterator<FeatureDescriptor> {
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private final ELContext context;
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private final Object base;
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private final ELResolver[] resolvers;
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private final int size;
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private Iterator<FeatureDescriptor> itr;
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private int idx;
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private FeatureDescriptor next;
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public FeatureIterator(ELContext context, Object base, ELResolver[] resolvers, int size) {
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this.context = context;
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this.base = base;
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this.resolvers = resolvers;
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this.size = size;
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this.idx = 0;
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this.guaranteeIterator();
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}
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private void guaranteeIterator() {
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while (this.itr == null && this.idx < this.size) {
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this.itr = this.resolvers[this.idx].getFeatureDescriptors(this.context, this.base);
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this.idx++;
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}
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}
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@Override
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public boolean hasNext() {
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if (this.next != null)
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return true;
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if (this.itr != null) {
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while (this.next == null && itr.hasNext()) {
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this.next = itr.next();
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}
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} else {
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return false;
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}
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if (this.next == null) {
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this.itr = null;
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this.guaranteeIterator();
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}
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return hasNext();
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}
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@Override
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public FeatureDescriptor next() {
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if (!hasNext()) {
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throw new NoSuchElementException();
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}
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FeatureDescriptor result = this.next;
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this.next = null;
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return result;
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}
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@Override
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public void remove() {
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throw new UnsupportedOperationException();
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}
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}
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}
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